It is possible that the main title of the report Marfan Syndrome is not the name you expected. Please check the synonyms listing to find the alternate name(s) and disorder subdivision(s) covered by this report.
As Jenny points out, being able to lisp the alphabet song at age two has little to do with 'knowing' the alphabet. And, yes, most children learn the letters by sight and sound in kindergarten, although most are capable of learning this information sooner if diligently taught by parents or others.
Teach a child to read who is as young as four. Children as young as four who have not yet learned to identify letters or use a mouse and keyboard can learn to read using this program. More advanced readers can use the program to move quickly to a third grade reading and writing level.